PURPOSE: To push a billet into main rolls for biting it in good conditions, by controlling the driving current of a DC motor of a pusher used for billet in accordance with the changes of length, temperature, and material of the billet, in piercing the billet by biting it by the main rolls.
CONSTITUTION: The length, deformation resistance, and temperature of a billet 11 to be pierced are inputted to a push-feeding various-elements setting device 25 from respective setters 26, 27 and a temperature detector 28. Further, a push- feeding force, a push-feeding speed, and a pre-feeding length are inputted to the device 25 by setters 29, 30, 31. The device 25 controls driving of a DC motor 16 of a pusher 13 used for the billet 11 through a Leonard device 32 basing on these respective set values to give the prescribed push-feeding force, push-feeding speed, pre-feeding position, and position of standing by to the pusher 13 so that the billet 11 is correctly bitten by the main rolls 14 to pierce it by a plug bar 15.
JPS6033807 | MANUFACTURE OF SEAMLESS PIPE AND PIERCER |
JPS60137511 | PLUG FOR MANUFACTURING SEAMLESS PIPE |
HAYASHI YASUYUKI
JPS563124A | 1981-01-13 |